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ICSE Class 10 Answered

Why does Pure Nitric Acid not dissolve noble metals but  aqua regia dissolve them?
Asked by pb_ckt | 29 Jan, 2019, 01:01: PM
answered-by-expert Expert Answer

Aqua regia:

HNO3 + 3HCl → NOCl +2H2O +2Cl2

Nitric acid reacts with hydrochloric acid to form a mixture called aqua regia.

The product formed NOCl nitrosyl chloride is a stronger oxidizing agent than nitric acid.
Hence pure nitric acid does not dissolve noble metals but  aqua regia dissolve them.
Answered by Ramandeep | 29 Jan, 2019, 03:36: PM

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